7222228 has 12 divisors (see below), whose sum is σ = 13611220. Its totient is φ = 3333312.

The previous prime is 7222219. The next prime is 7222279. The reversal of 7222228 is 8222227.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 315844 + 6906384 = 562^2 + 2628^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69393 + ... + 69496.

Almost surely, 2^7222228 is an apocalyptic number.

It is an amenable number.

7222228 is a deficient number, since it is larger than the sum of its proper divisors (6388992).

7222228 is a wasteful number, since it uses less digits than its factorization.

7222228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138906 (or 138904 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 7222228 is about 2687.4203244003. The cubic root of 7222228 is about 193.2963848006.

Subtracting 7222228 from its reverse (8222227), we obtain a palindrome (999999).

The spelling of 7222228 in words is "seven million, two hundred twenty-two thousand, two hundred twenty-eight".